Improved Chromakey of Hair Strands via Orientation Filter Convolution (bibtex)
by Chloe LeGendre, David Krissman, Paul Debevec
Abstract:
We present a technique for improving the alpha maŠing of challenging green-screen video sequences involving hair strands. As hair strands are thin and can be semi-translucent, they are especially hard to separate from a background. However, they appear as extended lines and thus have a strong response when convolved with oriented €filters, even in the presence of noise. We leverage this oriented fi€lter response to robustly locate hair strands within each frame of an actor’s performance fi€lmed in front of a green-screen. We demonstrate using production video footage that individual hair fi€bers excluded from a coarse artist’s mattŠe can be located and then added to the foreground element, qualitatively improving the composite result without added manual labor.
Reference:
Improved Chromakey of Hair Strands via Orientation Filter Convolution (Chloe LeGendre, David Krissman, Paul Debevec), In Proceeding of SIGGRAPH '17 ACM SIGGRAPH 2017, ACM Press, 2017.
Bibtex Entry:
@inproceedings{legendre_improved_2017,
	address = {Los Angeles, CA},
	title = {Improved {Chromakey} of {Hair} {Strands} via {Orientation} {Filter} {Convolution}},
	isbn = {978-1-4503-5015-0},
	url = {http://dl.acm.org/citation.cfm?id=3102200},
	doi = {10.1145/3102163.3102200},
	abstract = {We present a technique for improving the alpha maŠing of challenging green-screen video sequences involving hair strands. As hair strands are thin and can be semi-translucent, they are especially hard to separate from a background. However, they appear as extended lines and thus have a strong response when convolved with oriented €filters, even in the presence of noise. We leverage this oriented fi€lter response to robustly locate hair strands within each frame of an actor’s performance fi€lmed in front of a green-screen. We demonstrate using production video footage that individual hair fi€bers excluded from a coarse artist’s mattŠe can be located and then added to the foreground element, qualitatively improving the composite result without added manual labor.},
	booktitle = {Proceeding of {SIGGRAPH} '17 {ACM} {SIGGRAPH} 2017},
	publisher = {ACM Press},
	author = {LeGendre, Chloe and Krissman, David and Debevec, Paul},
	month = jul,
	year = {2017},
	keywords = {Graphics, UARC},
	pages = {1--2}
}
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